I would like to sincerely thank everyone who has contributed to the decision-making process. Now my shop for record pins and accessories is online: https://mrstylus.com/
@ArtcoInc Thank you for helping me to understand each version. I ended up with Frozen
@stratula The language pack worked wonderfully, thank you! @Gutesvonuns Brave, hold out, test. I have not done anything else (and probably most of them).
Live long and prosper

@ArtcoInc
Thank you for your detailed statement,
in fact, I see something clearer now. Can you tell me please if there is a way to import the products (descriptions in German and English) from 2.3.4 into the Community Edition (Responsive-osCommerce-master.zip)?
The customer data and orders are obsolete ...
OsC-BS, Edge, Final/Frozen are only different names or forks?
Thanks again!
Chriss